ICEMAN Throttle body questions
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Team ScioNRG
Joined: May 2004
Posts: 237
From: Fremont, Wisconsin
Anyone running this throttle body? Did it help...even a little bit?
http://www.importperformance.com/pag...E-BODY/TOY50MM
http://www.importperformance.com/pag...E-BODY/TOY50MM
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Originally Posted by LavaScionSouthernArizona
Anyone running this throttle body? Did it help...even a little bit?
http://www.importperformance.com/pag...E-BODY/TOY50MM
http://www.importperformance.com/pag...E-BODY/TOY50MM
I'm sure EL Prototypes had their own .. I run EL Prototypes overbored throttle body on my Corolla.... didn't notice much of a difference.. although I'm sure it helps with the turbo.
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Originally Posted by Minsk99
whats the question?
So? Anyword? Yea or nay?
Anyways, one thing I did recently read is that adding a larger throttle body is not always a productive mod unless the hole in the intake manifold is as large as the opening in the aftermarket TB. I'm not sure if this is the case, but it makes sense as the manifold would act as the bottleneck. Unfortunately our intake manifolds are plastic and enlarging/boring the hole might be impossible.(?) As far as I know there are no aftermarket IM for our engines (although the Blitz SC comes with one).
Also, adding a larger TB while having any exhaust restrictions might actually hurt performance. Not completely sure if this is true, but I read this in the Haynes guild to sport compact performance.
Here's a quote: "Don't even think about changing throttle bodies until you have removed all restrictions from the exhaust side of the vehicle... If you install a too-big throttle body now, and don't make your other modifications until much later, the interim period will find you with a low-rpm dog...."
So, at least from what I read it seems that a free-flowing cat or manifold back exhaust and header are definite precursor mods. Also, the plastic stock intake manifold might make any gains minimal at best. This mod seems to most productive for free-flowing engines that run at high rpm and need the extra flow to the TB.
Certainly not claiming to be an expert here, but from the initial research I did on this, that is what I came up with. Interested in what others think.

Originally Posted by EL Prototypes
Here is the deal with larger throttle bodies. The intake manifold is the problem. The flange which the TB (throttle body) is mounted onto is not flat. Its only flat spots are for the three mounting studs and the sealing oring. The oring is not round, it is in a very odd shape. You have to take it off to see what I am talking about. Anyway, if you enlarge the factory TB the oring will get sucked into the manifold and cause a leak. You cannot enlarge the hole behind it because the port is only 2mm thick. Break through that and you suck air in from around the outside of the TB. The corolla TB you speak of will bolt on but will suck in the oring and have a big air leak. We tried to make an adaptor plate and we eliminated the leaks,BUT the hole was still factory size and that made no HP. We are making a new manifold now with a larger TB and hope the power gains are there. We are conscerned that the aluminum will heat soak the intake charge and cancel out the gains. Guess we will find out.
Ok, so everyone has an opinion. But I thought the guy asked about that particular throttle body. If you have not bought one yourself, used it, or tested it on a dyno, you honestly have nothing to say. So please, someone that has bought, used or dynoed that iceman throttle body respond at some point.
If you have not bought one yourself, used it, or tested it on a dyno, you honestly have nothing to say.
Originally Posted by Minsk99
If you have not bought one yourself, used it, or tested it on a dyno, you honestly have nothing to say.
I bore throttle bodies mostly for Hondas. If you still have your stock exhaust and header, it won't do a thing. I know this from actual dyno experience I have been doing this for a very long time.
http://www.maxbore.com
http://www.maxbore.com



